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February 16, 2018 09:44
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Drag circles
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .active { | |
| stroke: #000; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <svg width="800" height="480"></svg> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"), | |
| radius = 60; | |
| var circles = d3.range(5).map(function (i) { | |
| return { | |
| x: (i+1)*width /6, | |
| y: 250, | |
| id: i+1 | |
| }; | |
| }); | |
| var color = d3.scaleOrdinal() | |
| .range(d3.schemeCategory20); | |
| svg.selectAll("circle") | |
| .data(circles) | |
| .enter().append("circle") | |
| .attr("cx", function (d) { return d.x; }) | |
| .attr("cy", function (d) { return d.y; }) | |
| .attr("r", radius) | |
| .style("fill", function (d, i) { return color(i); }) | |
| .on("mouseover", function (d) {d3.select(this).style("cursor", "move");}) | |
| .on("mouseout", function (d) {}) | |
| .call(d3.drag() | |
| .on("start", dragstarted) | |
| .on("drag", dragged) | |
| .on("end", dragended) | |
| ); | |
| function dragstarted(d) { | |
| d3.select(this).raise().classed("active", true); | |
| } | |
| function dragged(d) { | |
| d3.select(this).attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y); | |
| } | |
| function dragended(d) { | |
| d3.select(this).classed("active", false); | |
| } | |
| </script> | |
| </body> |
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